i was curious how they would improve on 2, how can you tell a new story that makes sense, how do you make the puzzles enjoyable and fresh, how do you innovate and create a similar yet distinct experience, much like portal 2 was for portal 1? it all just kind of works, and i gotta admit, i'm thoroughly impressed! while it isn't the most ground breaking/innovative experience, it definitely knows what i want in a portal game, immersion and awesome puzzles.
i really love how they teach you the game with one portal for a solid hour before moving on, i think it perfectly teaches you how to "think" and play the game it was designed. i rather preferred how it was handled in this game, you're given way more time to get acquainted with understanding the core concept at a nice pace. although i can totally see people getting frustrated and just wanting to play with 2 portals straight away.
i remember valve explicitly said they refused to use timing/reaction based puzzles. in this game it is actually used to increase difficulty, which isn't actually bad or anything, in fact i love it and it's the perfect direction to go. but it just cements to me that the series ended at portal 2, which is bitter sweet to think about. you really can't improve on this game anymore without changing it entirely and valve realises this.
for something free, and made with a small team, this is incredible. it really speaks the language of portal; the story, the vibes, the puzzles, the characters, music, just everything honestly. i can't believe i didn't have to pay for this! it's absolutely insane.
recommend if you want more portal content, this is the best sequel we will ever get i reckon.